Dermoid Cyst Communicating with the Subarachnoid Space and Lateral Ventricle: Demonstration by Metrizamide Computed Tomographic Cisternography

: The authors report a case of a dermoid cyst in the right anterior cranial fossa, which communicated spontaneously with both the subarachnoid space and the lateral ventricle. The communication was demonstrated by metrizamide computed tomographic cisternography before operation and was verified during operation.